Extremely high ambient temperature and high altitude will lower
Use STE-ICE to verify the tachometer is calibrated or to get a
reading when performing a stall check.
If check fails and a faulty tachometer is suspected, verify
tachometer reading by performing STE-ICE check number 10
before sending to next higher level of maintenance.
d) Tachometer reading above 2100 indicates transmission problems. Tachometer reading below 1900
rpm indicates a faulty engine. Troubleshoot fuel system. Check for correct vehicle tachometer
adapter. If no fault can be found, contact next higher level of maintenance.